Diva cup

Jam • Wife • 4/5/20 Ellie-Mae ♥️
I'm using a menstrual cup for the first time and I'm just wondering if what's going on is normal. I'm sure I put it in right, I checked the suction and I can't actually feel it inside me but The times I've put it in it makes me feel like I have to pee even though I just went. Then throughout the day whenever I go to the washroom it's a lot harder to pee. Like there's pressure making it difficult to get out!
It's also been making me feel crampy, but I've heard that it can happen to first timers especially. 
Is there something I'm doing wrong or will my body get used to it? 
I don't want to buy a new cup of a different brand because of how expensive they can be 😕